feat: add app.py as entrypoint

Author: erickod

app.py

@@ -0,0 +1,45 @@
+import os
+
+from fastapi import FastAPI
+from mangum import Mangum
+
+from system_notification.application.send_notification_usecase.send_notification_usecase import (
+    SendNotificationUseCase,
+)
+from system_notification.config.config import SETTINGS
+from system_notification.domain.notification_factory_caller import (
+    NotificationFactoryCaller,
+)
+from system_notification.domain.notifications.factories.slack_notification_factory import (
+    SlackNotificationFactory,
+)
+from system_notification.infra.http.controller.health_check_controller import (
+    HealthCheckController,
+)
+from system_notification.infra.http.controller.send_notification_controller import (
+    SendNotificationController,
+)
+from system_notification.infra.http.server.fastapi_http_server import FastApiHttpServer
+from system_notification.infra.http.server.flask_http_server import FlaskHttpServer
+from tests.infra.http.controller.api_notification_serializer import (
+    ApiNotificationSerializer,
+)
+
+server = FastApiHttpServer(app=FastAPI(root_path=f"/{os.environ.get('STAGE', '')}"))
+# server = FlaskHttpServer()
+factory_caller = NotificationFactoryCaller()
+factory_caller.add_factory(
+    SlackNotificationFactory(slack_token=SETTINGS.get("SLACK_API_TOKEN", ""))
+)
+uc = SendNotificationUseCase(factory_caller=factory_caller)
+send_notification_controller = SendNotificationController(
+    http_server=server,
+    send_notifcation_usecase=uc,
+    serializer=ApiNotificationSerializer(),
+)
+health_check_controller = HealthCheckController(
+    http_server=server,
+)
+handler = Mangum(server._app)
+if __name__ == "__main__":
+    server.serve(port=5000)